Whats wrong near our gas furnace? Its a OLD furnace. Its been near ever since my mom has...

Its a OLD furnace. Its been near ever since my mom has lived contained by the house which is about 32 years ago. And it seem that it will go stale and wont turn back on again. So after I have to push the reset button and it will be in motion on. Sometimes it will work normal, and consequently other times I will notice it get cold, and then I will adjust the knob on the furnace and it doesnt turn on, so after I go hit reset and it turns on. Its probably a furnace from the 1960's. Its a Williamson Gas furnace. And its green. We newly replaced the filter yesterday.
New house have a hot tub..HELP!?
Answers:    What is this reset button you are pushing, where is it located. Need sonme more info to know how to help you out. You can contact me via the email
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it could be various things. the thermocupple, ignition switch, the pilot, the gas line could be dirty...