Contact Seller
Jason Clarke Antiques
Tel07815 046645Please quote Antiques Atlas.
Mounted Baker Microscope
Rare Antique Elliott Brothers Brass Thermopile
Vintage Fuller's Calculator, English, Bakelite
Victorian Recording Rain Gauge by Callaghan & Co
Steam Engine Demonstration Model by Max Kohl
Baird & Tatlock brass sieve set, Endacotts
Antique Expedition Equipment
“Chemkit” Chemistry Set
Large Vintage Pantagraph, English, Brass, C.1950
Salesman's Sample of a Pearsons B1 Fire Detector
Plaster Botanical Model of a Sunflower
Antiique cased brass theodolite, English
Non UK callers :
+44 7815 046645
Demonstration Van Der Graaff by Philip Harris
For sale, a mid Twentieth Century demonstration Van Der Graaff Generator by Philip Harris.
This tabletop example is comprised of two galvanised steel supports set onto a wooden baseboard with rubber feet. The first support carries two acrylic shafts with collecting brushes at the top and bottom. A spindle is aso provided at each end, onto which a rubber belt is attached and over the top brush-plate is placed a metal dome.
The second base plate carries a pulley wheel with handle for manual operation which is attached by a band to the base spindle. The top of the plate also has a discharge wand attached via a hinge to allow the wand to be moved to different distances from the main dome. The side of the plate also has a connection in order for the generator to be electrically driven if preferred. The side is also marked with a Harris signature denoting the maker, Philip Harris
The Van Der Graaff generator works by means of the rubber belt moving over two rollers comprised of differing materials each with a comb, the top one connected to the hood and the bottom one connected to earth. Owing to the different materials of the rollers, the movement of the belt causes the transfer of electrons from one to the other. The bottom roller will be negatively charged, and the top positively charged. The excess positive charge is subsequently accumulated on the outer surface of the dome and builds up very large amounts of charge. If a wand was attached to the instrument at this point, then the electrons drawn up from the ground would be attracted to the positive charge in the dome and spark is generated.
Still in existence today, unusually the Philip Harris’s website pays little respect to its early history. The company began as Thomas Ellis in 1817 and Harris joined the company in 1825. Harris seems to have taken over the company around 1866 in Birmingham whereafter it grew significantly, and it remains a dominant provider of educational scienitific equipment today.
Circa 1960
SellerJason Clarke Antiques
View all stock from
Jason Clarke Antiques
Private dealer
By appointment only
Newbury
Berkshire
Tel : 07815 046645
Non UK callers : +44 7815 046645
This tabletop example is comprised of two galvanised steel supports set onto a wooden baseboard with rubber feet. The first support carries two acrylic shafts with collecting brushes at the top and bottom. A spindle is aso provided at each end, onto which a rubber belt is attached and over the top brush-plate is placed a metal dome.
The second base plate carries a pulley wheel with handle for manual operation which is attached by a band to the base spindle. The top of the plate also has a discharge wand attached via a hinge to allow the wand to be moved to different distances from the main dome. The side of the plate also has a connection in order for the generator to be electrically driven if preferred. The side is also marked with a Harris signature denoting the maker, Philip Harris
The Van Der Graaff generator works by means of the rubber belt moving over two rollers comprised of differing materials each with a comb, the top one connected to the hood and the bottom one connected to earth. Owing to the different materials of the rollers, the movement of the belt causes the transfer of electrons from one to the other. The bottom roller will be negatively charged, and the top positively charged. The excess positive charge is subsequently accumulated on the outer surface of the dome and builds up very large amounts of charge. If a wand was attached to the instrument at this point, then the electrons drawn up from the ground would be attracted to the positive charge in the dome and spark is generated.
Still in existence today, unusually the Philip Harris’s website pays little respect to its early history. The company began as Thomas Ellis in 1817 and Harris joined the company in 1825. Harris seems to have taken over the company around 1866 in Birmingham whereafter it grew significantly, and it remains a dominant provider of educational scienitific equipment today.
Circa 1960
Price The price has been listed in British Pounds.
Conversion rates as of 20/JAN/2025. Euro & Dollar prices will vary and should only be used as a guide.
Always confirm final price with dealer. Sold
Category Scientific Antiques
Period 1960s Antiques
Material Steel
Origin English
Maker Philip Harris Ltd
Item code as542a802
Status Sold
£0 
$0.00 
€0.00 
$
€
Conversion rates as of 20/JAN/2025. Euro & Dollar prices will vary and should only be used as a guide.
Always confirm final price with dealer. Sold
View all stock from
Jason Clarke Antiques
Private dealerBy appointment only
Newbury
Berkshire
Tel : 07815 046645
Non UK callers : +44 7815 046645
You may also be interested in
Mounted Baker Microscope
Rare Antique Elliott Brothers Brass Thermopile
Vintage Fuller's Calculator, English, Bakelite
Victorian Recording Rain Gauge by Callaghan & Co
Steam Engine Demonstration Model by Max Kohl
Baird & Tatlock brass sieve set, Endacotts
Antique Expedition Equipment
“Chemkit” Chemistry Set
Large Vintage Pantagraph, English, Brass, C.1950
Salesman's Sample of a Pearsons B1 Fire Detector
Plaster Botanical Model of a Sunflower
Antiique cased brass theodolite, English