A new or improved apparatus for protecting horticultural and agricultural crops against the effects of frosts

摘要

319,377. Taylor, F. A., and Taylor, H. A. March 22, 1928. Thermostats.-In temperature regulating apparatus for protecting crops from frost and controlling the temperature of glass houses, garages, store house, &c., comprising a thermostatically controlled electrical circuit adapted at predetermined temperatures electrically to ignite one or more pyrotechnic fuzes or devices which light or fire one or more heating devices, the thermostat comprises two metal strips 1 spaced apart at one end and connected together at the other, lever mechanism 4, 5, 6 being provided to magnify the movement of the connected end. At the predetermined temperature the lever 6 makes contact with an adjustable screw 7 provided with a vernier temperature scale, and thus closes the circuit of a battery 9 which then fires a firework or other pyrotechnic fuze 10.