Vintage Engineers Pocket Fob Watch Para-Volt High & Low Reading Voltmeter Circa 1920s Battery Tester
- Customer Reviews
Warning - these meters can be very dangerous as insulation to the metal case could be faulty and expose the user to very high currents or voltages....but are ideal for testing small batteries...
Item - Vintage Engineers Pocket Watch Style 'Para-Volt' Voltmeter, Circa 1920s.....for more info see below
Maker - Unknown - marked PARA-VOLT but more likely to be tradename
Marks - Printed to face with all details
Circa - 1920s
Country of Origin - Unknown (marked as FOREIGN)
Dimensions - 2.125" in diameter
Weight - 64 gram
Condition - Excellent Used Condition, fully working with good clear glass.
Other Interesting Points - Pocket watch style Voltmeters were first used in the 1880/90s but became widespread during the 1920/30s with most having a brass case that was typically nickel plated though Bakelite examples are known. The case was normally connected to the negative connection, an arrangement that caused numerous electric shocks especially when the rubber insulation within failed. These little testers were used for many tasks but they were designed to be used by Radio Engineer's for measuring the "plate" (anode) voltage of thermionic valves in radios and their grid voltages hence the two separate scales one measuring 0 to 12 volts and the other measuring 0 to 120 volts which was dependent on which spike (foot) was used at the bottom of the meter. The insulated wire that came from the top of the meter was touched onto the negative terminal while the spike/foot was placed on the positive terminal and the reading would be taken from the scale.
(Please see all Photos).
POSTAGE & PACKAGING
There is a charge of £3.00 for Postage and Packaging to all U.K. Residents (1st Class Mail), we also ship Worldwide please check table below for delivery costs. If you have any questions please feel free to contact!
|Next Day UK Delivery||£7.00|
|Signed For UK Delivery||£4.00|
|Standard UK Delivery||£3.00|
|Air Mail Europe||£4.50|
|Air Mail Outside Europe||£6.00|